1580s, Logos, "the divine Word, second person of the Christian Trinity," from Greek logos "word, speech, discourse," also "reason," from PIE root *leg- "to collect" (with derivatives meaning "to speak," on notion of "to pick out words;" see lecture (n.)); used by Neo-Platonists in various metaphysical and theological senses and picked up by New Testament writers.

Other English formations from logos include logolatry "worship of words, unreasonable regard for words or verbal truth" (1810 in Coleridge); logomania (1870); logophobia (1923).

logo

n.

1937, probably a shortening of logogram "sign or character representing a word."